1985 keyless entry problems, HELP

I'm having trouble with my keyless entry. I don't know the code and I also don't have an owner's manual to program it either. I've been reading some other posts about this subject, some say that there is a code in the car on a metal box, but I don't know where it is on an 85. It's a great feature, but sucks if you don't know the code!! Can anyone help me?

hi please i need help badly, can you get me the carfax this VIN: JN8AZ08W83W234783

send it to my email please

thank you